重铬酸钾滴定法测定云母磁铁矿中的铁

Determination of Mica Magnetite Iron by Potassium Dichromate Titration

样品经氢氧化钾熔融、热水提取、盐酸酸化后,利用动物胶凝聚的方法分离硅,母液定容到250 mL容量瓶,分取100 mL母液到锥瓶中,经氯化亚锡还原后加入硫磷混合酸、氯化汞和二苯胺磺酸钠,用重铬酸钾标准溶液进行滴定。

The samples were melted by potassium hydroxide, extracted hot water, acidification with hydrochloric acid, then the silicon was removed from the samples with the method of animal glue condensing. The mother liquor was constant volume to the 250 mL flask, and then move 100 mL volume of mother liquor into the conical bottle with a pipette, added with the mixed sulfur and phosphorus acid, mercuric chloride and diphenylamine sulfooate after stannous chloride reduction, then titrated using potassium dichromate standard solution.